Just a side note about this process as well, since this is like booking for a hotel room, it is also

With all the conveniences that you can get from renting a car, you may want to take advantage of such service even if you are outside of the US. That is not an impossible task as there are companies that allows you to go for a car hire in Spain. But to make things even more simpler, best car rental rates in phoenix you can do it even right now over the internet.
best car rental rates in phoenix Well in most car hire companies in the US, at times they would require you to be physically present at the time of the rent because they need to have a few IDs and a few things filled out. But that does not seem to be a possible solution when you are about to rent a car in Spain. So they got that handled for you guys as you can simply fill out a form inside the website and that is all you need.
Just a side note about this process as well, since this is like booking for a hotel room, it is also a good idea to have your bookings done in an early manner so that you can get the best car hire at the best prices. Otherwise, you may end up with a few choices and sometimes nothing at all.
With that being said, with the use of modern technology, you can now book for a car rental service in Spain before you even get there so that you can have all the conveniences of renting a car outside of the US. Just keep in mind to book things really early so that you can have the best options available for you.